{"id":"F2006B02394","name":"AD/AMD 50/28 - Rear Fuel Tank Protection","slug":"ad-amd-50-28-rear-fuel-tank-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41624,"registerId":"commonwealth-F2006B02394-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAMD Falcon 50 and 900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/AMD 50/28 Rear Fuel Tank Protection 2","sectionType":"part","heading":"AD/AMD 50/28 Rear Fuel Tank Protection 2/2003","content":"# AD/AMD 50/28 Rear Fuel Tank Protection 2/2003\n\nApplicability: Mystère Falcon 50 aeroplanes with BFGoodrich Stormscope® antenna installed between frames 22 and 23 by Dassault Aviation modification M2208 or by a DFJ Little Rock modification, except aeroplanes on which modification M2838 or Service Bulletin (SB) F50-404 has been implemented.\n\nMystère Falcon 900/Falcon 900EX aeroplanes with Stormscope® antenna installed between frames 23 and 24 by Dassault Aviation modification M2993 or by a DFJ Little Rock modification, except aeroplanes on which modification M3498 or SB F900-293 or SB F900EX-158 has been implemented.\n\nRequirement: Reinforce the rear fuel tank by installing a shield plate over the fuel tank structure above the Stormscope® antenna and replace the antenna plug connector. Both these actions are to be accomplished in accordance with the following Service Bulletins, as applicable:","sortOrder":1},{"sectionNumber":"Aeroplane Model","sectionType":"part","heading":"Aeroplane Model","content":"## Aeroplane Model\n\nFalcon 50\n\nFalcon 900 Falcon 900EX\n\nNote: DGAC AD 2002-569(B) refers.","sortOrder":2},{"sectionNumber":"Service Bulletin","sectionType":"part","heading":"Service Bulletin","content":"##   \nService Bulletin\n\nF50-404 F900-293 F900EX-158","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition (rear fuel tank vulnerability) on specific aircraft configurations. The applicability section precisely targets the affected fleet without expansion beyond the original safety issue."},"complexity_factors":["Multiple applicability conditions with nested exceptions (4 specific modification/service bulletin exemptions across 3 aircraft variants)","Cross-reference to French aviation authority directive (DGAC AD 2002-569(B))","Technical aviation terminology requiring specialised knowledge (frame numbers, modification numbers, service bulletins)","Three different service bulletin references depending on specific aircraft model","Conditional logic: applicability depends on specific prior modifications AND specific installation methods"],"plain_english_summary":"CASA requires owners/operators of certain Dassault Falcon 50, 900 and 900EX jets with a BFGoodrich Stormscope antenna in the rear fuselage to reinforce the rear fuel tank (install a shield plate) and replace the antenna connector per Dassault service instructions. \n\nAircraft already modified by later specified mods/service bulletins are exempt. The AD prevents antenna-induced fuel-tank damage that could lead to leaks, fire, or structural failure."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The provided text sets the current applicability and exemptions but does not compare to or describe any earlier instrument. It excludes aircraft already modified by the listed later modifications or service bulletins (Applicability), but the document itself does not state whether that exclusion altered the AD's original scope."},"complexity_factors":["Narrow technical applicability keyed to aircraft model, antenna location and specific modification numbers (Applicability).","Exemptions for aircraft that have later modifications or specific service bulletins implemented, which requires operators to verify modification history (Applicability).","Two mandatory technical actions (install shield plate; replace antenna plug connector) that must follow detailed Dassault service bulletins (Requirement; Service Bulletin list: F50-404, F900-293, F900EX-158).","Regulatory basis and enforcement through CASA under CAR 1998 subreg 39.1(1), creating an administrative compliance obligation (preamble).","Cross-reference to a foreign authority AD (DGAC AD 2002-569(B)), adding an external compliance and information source (Note).","Implementation requires access to OEM service bulletins and likely maintenance facility time and parts, creating operational and cost implications for operators (Requirement)."],"plain_english_summary":"Requires operators of Mystère Falcon 50 and Falcon 900/900EX aeroplanes that have a BFGoodrich Stormscope® antenna installed in specified fuselage bays to fit a shield plate over the rear fuel tank above the antenna and to replace the antenna plug connector (Applicability; Requirement). The CASA delegate issues this AD under CAR 1998 subreg 39.1(1); owners/operators must perform the work in accordance with the listed Dassault service bulletins unless the aircraft already has the identified later modifications or service bulletins implemented."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection","history":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection/history","analysis":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection/analysis","conflicts":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection/conflicts","importantCases":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection/important-cases","documents":"/api/acts/ad-amd-50-28-rear-fuel-tank-protection/documents"}}